/* 游戏选项界面 */
.form-box {
    /* 一下四个样式是让元素居中 */
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    /* 布局 */
    display: flex;
    flex-direction: column;
    align-items: center;
    /* 外观 */
    border: 1px solid #acacac;
    border-radius: 5px;
    padding: 0px 40px;
}

.form-box>* {
    padding: 10px 0px;
}

.form-row {
    display: flex;
    align-items: center;
}

.form-row>span {
    margin-right: 10px;
}

.form-row>button {
    padding: 5px 10px;
}